The cryptographic signature guarantees the file is safe to install and was not tampered
with in any way.

5.6.5:
What's new:
Enhance your emails with artist-designed stationery - Choose from dozens of options from Paperless Post to make your email stand out.
Save your data with faster document preview - Preview a large attachment in seconds without having to download it to your mobile phone.
Check on all your accounts from your home screen - With our newest widget, you can see the number of unread emails in each mailbox directly from your home screen.

With its beautiful design, easy-to-use interface, and lightning fast speed, the Yahoo Mail app makes reading, organizing, and sending emails across your inboxes (Gmail, Outlook, AOL and more) easier than ever. Yahoo Mail offers 1000GB of free cloud storage, so you never have to delete a message again.